Exporting to quicktime out of sync

Hello all
This is the first time i have exported out of final cut but when i do the sound goes out of sync almost straight away... i export to quicktime and this seems fine then when i burn a disc the disc is out of synce ie the picture and sound dont match up...they start in sync but after around 5 sec it starts to drift
please help over come this if possible and thanks in advance

hello thank you for the replies but i am unsure what you both mean .... i have a sequence that has audio on it that was captured with the camera.... i have also added some audio from a cd and you tube in places.... however the audio goes out of sync long before these extra additions come in

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